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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 5,864,490	$ 5,542,849
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,809,480	4,476,440
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	852,294	859,578
Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	464,356	457,706
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	387,938	401,872
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,055,010	1,066,409
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	759,286	763,331
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	295,724	303,078
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	7,177	6,421
Total | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,783	4,804
Total | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,539	3,567
Total | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,244	1,237
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,394	1,617
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,049	1,598
Total | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	345	19
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,491	1,473
Land | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,491	1,473
Land | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,111	1,111
Land | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	380	362
Land | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Land | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Land | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,410	1,644
1-4 Family | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	16	27
1-4 Family | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
1-4 Family | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	16	27
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,394	1,617
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,049	1,598
1-4 Family | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	345	19
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,990	3,018
Non-residential real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,990	3,018
Non-residential real estate | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,428	2,456
Non-residential real estate | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	562	562
Non-residential real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Non-residential real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Non-residential real estate | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	286	286
Other non-real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	286	286
Other non-real estate | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	286	286
Other non-real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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